Pet food supplement



FIG. 1 is a perspective view of a pet food supplement embodying a new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a side view thereof.

The broken lines shown in the drawings illustrate unclaimed portions of the pet food supplement and form no part of the claimed design. 

CLAIM The ornamental design for a pet food supplement, as shown and described. 